372XPW not running right

[gregn]

Need some help guys. My 372XPW shuts down when I lift off the throttle at WOT or mid-range not everytime but getting worse. It's hard to get back started, the engine spins over a little faster when the starter cord rewinds but still dosent start. The engine is starting to have a different sound to it while idling down. It has spark when I turn it over everytime . I changed the fuel line and filter no help. It runs good and cuts good until it decides to shutdown. Took the carb apart its clean. 135 psi cold. Changed the already fresh plug it was a little black no help. What else do I need to check?

 

[tlandrum]

its low on compression for starters. sounds like air leak too

 

[gregn]

i'm guessing the air leak could be in multiple places?? Where to start checking at?

 

[tlandrum]

with the saw having such low compression ,first thing id do is re-ring it. new seals, new fuel line and impulse hose,check intake boot for holes or cracks.

 

[funky sawman]

Well compression is not low. most 372's I test new have 140#. But for me 140# is too low LOLOLOL. the saw should run fine without air leaks at 120psi comp.

 

[jus2fat]

I'm thinkin'...Bad Coil..!!..??

J2F

 

[almondgt]

Pull the muffler. Look at the piston face and then lower the piston and look at the back wall of the cylinder in search of scoring. You will then have a great day or you will :weep:

 

[7hpjim]

Its junk!!!!, pm me for proper disposal!!!!:hmm3grin2orange:

 

[tlandrum]

i guess you could say ive had a few 372's myself and built probably 50 of them. they all fell in the 150 range.

 

[funky sawman]

even at 150, 135 is still well above the 120 minimum requirement that husqvarna states

 

[gregn]

with the saw having such low compression ,first thing id do is re-ring it. new seals, new fuel line and impulse hose,check intake boot for holes or cracks.

Where do you get your new ring from Husky dealer or aftermarket?

 

[tlandrum]

caber rings work great. if youve got a saw at the low side of compression and use a compression release ,that may be your problem with starting. i have had many saws that just woulnt start when using the decomp.

 

[gregn]

Oh didnt know that thanks! I have been using the decomp valve. I can only get it to start once it has completly cooled down.

 

[tlandrum]

try it without the decomp and it should fire much easier,as in first pull warm.

 

[gregn]

just tried starting it, engine cool, nothing after 10 pulls. checked fire has it. put drop of fuel in cylinder still nothing after 10 more pulls. is it possible to have a spark but not strong enough to start it?

 

[tlandrum]

its possible that the cast in key way is sheared and it not firing at the right time.

 

[funky sawman]

More than likely a bad ignition module, very common for these to fail, I have warrantyed out over 100 last year alone on 372 and 365 saws

 

[Anthony_Va.]

I've got a new limited coil here if you find thats the problem.

 

[funky sawman]

The ONLY way to shear a flywheel key is the flywheel nut is loose. Normally if the key is sheared and the nut is loose the saw will pull over funny, kinda like its slipping .

 

[gregn]

More than likely a bad ignition module, very common for these to fail, I have warrantyed out over 100 last year alone on 372 and 365 saws

would it still show a spark turning it over if it were bad?